package cn.com.zal.cgweb.filters;

import java.io.*;
import javax.servlet.*;

/**
 *
 * <p>Title: �ַ������</p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2007</p>
 *
 * <p>Company: ������</p>
 *
 * @version 1.0
 */
public class EncodingFilter implements Filter {
  protected String encoding = null;
  protected FilterConfig filterConfig = null;
  protected boolean ignore = true;

  public void destroy() {
    this.encoding = null;
    this.filterConfig = null;
  }

  public void doFilter(ServletRequest request, ServletResponse response,
                       FilterChain chain) throws IOException,
      ServletException {
    if (ignore || (request.getCharacterEncoding() == null)) {
      String encoding = selectEncoding(request);
      if (encoding != null) {
        request.setCharacterEncoding(encoding);
      }
    }
    chain.doFilter(request, response);

  }

  public void init(FilterConfig filterConfig) throws ServletException {
    this.filterConfig = filterConfig;
    this.encoding = filterConfig.getInitParameter("encoding");
    String value = filterConfig.getInitParameter("ignore");
    if (value == null) {
      this.ignore = true;
    }
    else if (value.equalsIgnoreCase("true")) {
      this.ignore = true;
    }
    else if (value.equalsIgnoreCase("yes")) {
      this.ignore = true;
    }
    else {
      this.ignore = false;
    }
  }

  protected String selectEncoding(ServletRequest request) {
    return (this.encoding);
  }
}
